package com.example.tests;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import com.thoughtworks.xstream.XStream;

public class GroupDataGenerator {

	public static void main(String[] args) throws IOException {
		
		if (args.length < 3) {
			System.out.println("Please specify parameters: <amount of test data> <file> <format>");
			return;
		}
		
		int amount = Integer.parseInt(args[0]);
        File file = new File(args[1]);
        String format = args[2];
        
        if (file.exists()) {
        	System.out.println("File  exists, please remove it manually: "+ file);
			return;
        }

        List<GroupData> groups = generateRandomGroups(amount);
        if ("csv".equals(format)) {
            saveGroupsToCsvFile(groups, file);
        } else if ("xml".equals(format)) {
            saveGroupsToXmlFile(groups, file);
        } else {
            System.out.println("Unknown format" + format);
            return;
        }
		}

		private static void saveGroupsToXmlFile(List<GroupData> groups, File file) throws IOException {
		XStream xstream = new XStream();
		xstream.alias("group", GroupData.class);
		String xml = xstream.toXML(groups);
		FileWriter writer = new FileWriter(file);
		writer.write(xml);
		writer.close();
		}
		
		public static List<GroupData> loadGroupsFromXmlFile(File file) {
			XStream xstream = new XStream();
			xstream.alias("group", GroupData.class);
			return (List<GroupData>) xstream.fromXML(file);
		}

		private static void saveGroupsToCsvFile(List<GroupData> groups, File file) throws IOException {
			FileWriter writer = new FileWriter(file);
            for (GroupData group : groups) {
                writer.write(group.getName() + "," + group.getHeader() + "," + group.getFooter() + ",!" + "\n");
			}
			writer.close();
		}

		public static List<GroupData> loadGroupsFromCsvFile(File file) throws IOException {
			List<GroupData> list = new ArrayList<GroupData>();
			FileReader reader = new FileReader(file);
			BufferedReader bufferedReader = new BufferedReader(reader);
			String line = bufferedReader.readLine();
			while(line != null) {
				String[] part = line.split(",");
				GroupData group = new GroupData()
				.withName(part[0])
				.withHeader(part[1])
				.withFooter(part[2]);
				list.add(group);
				line = bufferedReader.readLine();
			}
			bufferedReader.close();
			return list;
			}
		
		public static List<GroupData> generateRandomGroups(int amount) {
			 List<GroupData> list = new ArrayList<GroupData>();
			 for (int i = 0; i < amount; i++) {
				 GroupData group = new GroupData()
				    .withName(generateRandomString())
				 	.withHeader(generateRandomString())
				 	.withFooter(generateRandomString());
				 list.add(group);
			 }
			 return list;	 
		}

		public static String generateRandomString() {
			 Random rnd = new Random();
			 if (rnd.nextInt(3) == 0) {
			   return "";
		     } else {
			 return "text" + rnd.nextInt();
		     }
		}
	
}
